I used to work for the Free Software
Foundation's GNU Project. The Project's goal is to produce the GNU
operating system, a complete Unix-like operating system conformant to
POSIX.1 and upward compatible with 4.4 BSD. Source code for the whole
system will be freely available and copylefted so it stays
free.

I was working on the GNU Hurd with
Thomas Bushnell
The Hurd is a set of server
programs that run on the
Mach 3.0 microkernel
from CMU to
provide a operating system services; we are using the
Mach4 distribution from Utah. The GNU C library uses these
services to provide a POSIX.1-compatible programming interface.